We conducted a double blind , randomized, placebo controlled trial, for two years, enroling, simultaneously, 186 end-stage kidney disease patients of any cause, older than 18 years of age, stable on hemodialysis, assigned to receive either oral folic acid 10 mg three times a week on post dialysis sessions, under nurse supervision or an identical appearing placebo for the entire lenght of the study, from april 2003 to march 2005.